Kloster Cruise, Coral Gables, Fla., said it will merge its upscale Royal Cruise Line into its mass market brand, Norwegian Cruise Line, and will rename the company Norwegian Cruise Line
. The company, which has been suffering financial woes and has been the target of take-over rumors, will close its San Francisco and Athens, Greece, offices. Goodby
, Silverstein & Partners, San Francisco, handles advertising for both lines.